From: Ron Miller (rmiller@Brocade.COM)
Date: Mon Feb 28 2000 - 16:54:58 PST
Im from the microwave origin in SI now.
You cannot get more accurate measurements than from a
network analyzer measuring the s-parameters.
FFT and convolution are not tricks and have been around for
ADS can be used with an optimization routine to generate values
for an assumed schematic using curve fitting quite nicely.
Your question should have been "how close to s-parameters can
a TDR measure? The answer given me by NIST Don Degroot
in bolder Colorado is that TDNA a time domain program that
converts a TDR/TDT to s-parameters comes within about .5 db of
the network analyzer(standard) out to about 10 Ghz.
Kai Keskinen wrote:
> Hi Folks:
> I'm in the interconnect group where connectors are our thing. I'm the high
> speed modeling guy. I take those connector spice models and make sure the
> connector will work with our drivers/signal paths/receivers. I have a lot of
> experience with connector models made using TDR measurements. I have recently
> been sent some models that appear somewhat dubious. The vendor group that made
> the measurements says they only use a network analyzer and then do the inverse
> fft and some other tricks to get the time domain. They have some way to fit
> parameters to a model to get a match to their measurements. My question is, is
> the frequency domain method as good as using the TDR at various edge rates?
> Thanks in advance for your comments.
> Kai Keskinen
> Equipment and Network Interconnect
> Nortel Subsystems and Performance Networks (NSPaN)
> (613)-765-3506 (ESN 395)
-- Ronald B. Miller _\\|//_ Signal Integrity Engineer (408)487-8017 (' 0-0 ') fax(408)487-8017 ==========0000-(_)0000=========== Brocade Communications Systems, 1901 Guadalupe Parkway, San Jose, CA 95131 firstname.lastname@example.org, email@example.com
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